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Projektbericht BELLE Vorstandssitzung 19. Mai 2005 -3]mc 32by[k.

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Presentation on theme: "Projektbericht BELLE Vorstandssitzung 19. Mai 2005 -3]mc 32by[k."— Presentation transcript:

1 Projektbericht BELLE Vorstandssitzung 19. Mai ]mc 32by[k

2 KEK, ce^ Tokyo Projektbericht BELLE Status BELLE Experiment Die Zukunft von BELLE Neue Resultate (Hot Topics) Collaboration HEPHY Physik-Analysen

3 Projektbericht BELLE Vorstandssitzung 19. Mai ]mc 32by[k L peak = 1.56 × cm -2 sec -1 design = cm -2 sec KEKB Collider e-e- 8GeV e+e+ 3.5GeV = B-Factory (on the 4s resonance) B-Factory (on the 4s resonance) BB threshold

4 Projektbericht BELLE Vorstandssitzung 19. Mai ]mc 32by[k ~400 million BB pairs KEKB PEP-II ~256 million BB pairs

5 Projektbericht BELLE Vorstandssitzung 19. Mai ]mc 32by[k Belle Detector (2005) 7 sub-detectors for precise –Vertexing, –Tracking, –Particle ID, –Calorimetry

6 Projektbericht BELLE Vorstandssitzung 19. Mai ]mc 32by[k Upgrade plan (near future) CDC Faster front end electronics Faster trigger signal Optimization of the tracking code KLM Scintillator tile with SiPM readout ECL Waveform sampling Pure CsI crystal for endcap Optimization of the clustering code SVD Shorter strip/pixel for the inner layers Faster readout electronics Optimization of the vertex code DAQ upgrade TDC based readout pipelined system Dead time free up to 5kHz trigger rate Computing system upgrade CPU, mass storage and network system

7 Projektbericht BELLE Vorstandssitzung 19. Mai ]mc 32by[k Layer 1 replacement is scheduled in 2007 summer SVD3 schedule depends on approval of the project Luminosity (10 34 ) SVD2.0 Reinforcement SVD2.0SVD2.5 Replace L1 ladders SVD2.5SVD3 Full upgrade R&D Prod. Test Prod. Test R&D Installation Direction SUPERBELLE SVD Upgrade schedule

8 Projektbericht BELLE Vorstandssitzung 19. Mai ]mc 32by[k Simulation Study for Higher Beam Background Detail was reported in the last WS by K.Senyo. MC +BGx1MC+BGx20

9 Projektbericht BELLE Vorstandssitzung 19. Mai ]mc 32by[k One possibility would be to measure the time between trigger and the hits. Thus off-time hits can be discarded. Hits in the selected trigger window are event candidates. The APV25 has the possibility to store 3 consecutive samples (spaced by the system clock) of a signal (multi-peak mode) with one trigger. With a second trigger just 3 clocks later, you can get the next 3 time samples of the shaped input signal. We can use this possibility to determine the time between shaped detector signal and clock. Background reduction using the multi-peak mode Most hits from background events are not correlated (in time) with the trigger (continuous beam). At the moment we have a time window to accept data of >2400 ns for the VA1TA and ~150ns (50ns peaking time) for the APV25. This window of 150ns should be reduced again. Additional reduction of the time window (and thus of the background) by a factor around 8-10! Interesting proposal by the Vienna group (M.Pernicka) to reduce background induced occupancy in Vertex detector reduction with the possibilities of APV25 and Background reduction using the multi-peak mode Hawai 05 Workshop Summary by M. Giorgi

10 Projektbericht BELLE Vorstandssitzung 19. Mai ]mc 32by[k KEKB Collider Upgrade Scenario ~10 10 B mesons/year !! & also + - L peak = cm -2 s -1 L tot = 431fb -1 (May.14, 2005) crab cavities Major upgrade of KEKB & Belle (>1yr shutdown) world records ! 1.5x fb -1 ~5x10 34 ~1 ab -1 ~5x10 35 ~10 ab -1 L peak (cm -2 s -1 ) L int

11 Projektbericht BELLE Vorstandssitzung 19. Mai ]mc 32by[k Severe (financial) problems when it is compared with

12 Projektbericht BELLE Vorstandssitzung 19. Mai ]mc 32by[k Scenarios in the next decade LHC finds SUSY LHC turns on LHC doesnt find SUSY We are here HEP What can the ILC say about SUSY-breaking models? What can a Super B Factory say about SUSY-breaking models? Much interesting work has already been done on this topic. Can we find a more effective way to get the message across?

13 Projektbericht BELLE Vorstandssitzung 19. Mai ]mc 32by[k Pessimistic (?) Conclusions of Hitlin (BaBar Spokesman) What is needed to make the case A credible integrated luminosity capability approaching 10 ab -1 /year –An accelerator with an upgrade path, as with the current B Factories –A detector that is conservatively designed and able to cope with background surprises and future luminosity upgrades A credible plan for gathering a data sample of 10s of ab -1 that allows the marquee important measurements to be made on a time scale that is competitive with LHCb and relevant to clarifying SUSY discoveries –An algorithm that there demonstrates the power of a real-time dialog between the LHC, a Super B Factory and, eventually, the ILC, would be a killer app We have made real progress on this – more is needed Discussions on forming a truly international collaboration on an appropriately scaled accelerator and detector –This would, for example, facilitate an ICFA endorsement –This could provide a critical mass of people and funding potential to convince the community that a Super B Factory should go forward

14 Projektbericht BELLE Vorstandssitzung 19. Mai ]mc 32by[k Neue Resultate – X(3940) ee J/ψ X, all currently available data (Exp7-41) ηcηc η c χ c0 X(3940)

15 Projektbericht BELLE Vorstandssitzung 19. Mai ]mc 32by[k Neue Resultate – X(3872) B KX(3872), X ππJ/ψ, data from Exp7-39 X(3872) ψ(2s)

16 Projektbericht BELLE Vorstandssitzung 19. Mai ]mc 32by[k J PC possibilities for X(3872) J 2 DD allowed & P- violating unlikely signal for X γJ/ψ C=-1 ruled out check of angular distributions rules out 1 ±-,0 ±+,2 -- fits of M ππ 2 -+ unlikely X(3872) = χ c1 ? unlikely, since mass and BR ratio way off theo. expect.

17 Projektbericht BELLE Vorstandssitzung 19. Mai ]mc 32by[k HEPHY Physik-Analysen Heinz Dibon: Parallelanalyse semileptonische D° Zerfälle Franz Mandl: Studie der inklusive Zerfälle D° K*X / X Gerald Richter: Dekohärenz Modelle verschränkter B-Paare Christoph Schwanda: Matrixelemente der HQET Laurenz Widhalm: Formfaktoren semileptonischer D° Zerfälle

18 Projektbericht BELLE Vorstandssitzung 19. Mai ]mc 32by[k Heinz Dibon Parallelanalyse semileptonischer D°-Zerfälle Zweck: Cross-Check der Analysemethode von LW, Quantifizierung von deren Effizienzvorteil Rekonstruktion des Neutrinos gelingt bereits (siehe plot), derzeit wird an der Optimierung der cuts gearbeitet Neutrino Auflösung |p true | - |p rec | in GeV

19 Projektbericht BELLE Vorstandssitzung 19. Mai ]mc 32by[k Franz Mandl Inclusive Decays D 0 K* 0 X and D 0 0 X Some time ago ( Fig) reported: B (D 0 K*X) B (K* K - + ) 6.67% B (D 0 K*X) 10% Method: Full reconstruction of events: + 0, 1, 2 primary mesons tag side signal side right sign e + e - preliminary studies on efficiences etc have been reported (also for D 0 0 X) all particles left over in reconstruction should come from D 0 (signal side) ideal method for the determination of inclusive branching ratios for D 0 hX, h = K* 0, 0,,, ……. (not yet known)

20 Projektbericht BELLE Vorstandssitzung 19. Mai ]mc 32by[k some time ago B(D 0 K*X) * B(K* K - + ) = * 3.8% = 6.67% K - + effective masses of combinations of charged particles from kinematically selected D 0 via recoil, tagging D *+ D *-, D *+ D *- 0 and D *+ D *- + -, …. events not in PDG list OLD Franz Mandl

21 Projektbericht BELLE Vorstandssitzung 19. Mai ]mc 32by[k line: e + e D* + D* MC (2 pr) red crosses: e + e D* + D* ( 0, data (2, 3, 4 pr) D 0 K* 0 X (signal) D 0 K X D 0 h 1 X h 2 X at least one particle misidentified M (K ) arbitrary normalization ok for 3, 4 pr Franz Mandl

22 QM coherence model investigations cτ B0 = 462 μm (LAB) Δm = ћs -1 = τ B0 beam axis 3.5 GeV e + 8 GeV e - B0B0 B0B0 B0B0 entanglement region entanglement region l-l- l+l+ K0sK0s π-π- π+π+ μ+μ+ full reconstructionside (FR)full reconstructionside (FR) partial reconstructionside (PR)partial reconstructionside (PR) example reaction z 0, t 0 z 1, t 1 z 2, t 2 expected resolutions QM predicted asymmetry + CoMo (PV) Gerald Richter

23 QM coherence model investigations preliminary studies: ML-fit sensitivity for assumed Model and errors preliminary studies: ML-fit sensitivity for assumed Model and errors Status: preliminary studies finished, fit method delivers sufficient sensitivity Gerald Richter

24 QM coherence model investigations defining cuts on MC- data to achieve sufficient time resolutions Status: improving primary vertex resolution resolutions so far resolutions so far Gerald Richter

25 Projektbericht BELLE Vorstandssitzung 19. Mai ]mc 32by[k Christoph Schwanda

26 Projektbericht BELLE Vorstandssitzung 19. Mai ]mc 32by[k Christoph Schwanda

27 Projektbericht BELLE Vorstandssitzung 19. Mai ]mc 32by[k Christoph Schwanda

28 Projektbericht BELLE Vorstandssitzung 19. Mai ]mc 32by[k K D D* mass- / vertex fit e+e- 3.5 GeV8 GeV K K D* D e/µ Method of full inclusive reconstruction inverse fit additional primary mesons Laurenz Widhalm

29 Projektbericht BELLE Vorstandssitzung 19. Mai ]mc 32by[k Overview Background Composition neutrino invariant mass squared, all cuts applied except neutrino mass cut right sign* wrong sign* right sign* wrong sign* m ² / GeV² signal non-D° bkg hadronic bkg, misidentified kaons hadronic bkg, misidentified pions bkg from D° Kl bkg from D° K*l D° *l + + D° e D° D ATA Laurenz Widhalm

30 Projektbericht BELLE Vorstandssitzung 19. Mai ]mc 32by[k q² distribution – comparison of models ISGW2 model lattice calc. pole model Analyse derzeit in der Refereeing Stage / Präsentation auf Sommer Konferenzen in Vorbereitung pole mass – comp. with CLEO & FOCUS D 0 l

31 Projektbericht BELLE Vorstandssitzung 19. Mai ]mc 32by[k Ereignisrekonstruktion in C++ bei BELLEPDA Seminar 11/02 Laurenz Widhalm

32 Projektbericht BELLE Vorstandssitzung 19. Mai ]mc 32by[k Baseline design for SUPERBELLE CDC SVD Shoji Uno


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